Kwiksen 4pcs Universal Heated Upstream Downstream Oxygen Sensor 234-4694 +234-4696 O2 Sensor 1 Sensor 2 for 1999-2004 Land Rover Discovery PART NUMBER: 234-4694 x2, 234-4696 x2 Up and Down O2 Sensor for 2003-2004 Land Rover Discovery 4.6L Upper and Lower O2 Sensors for 1999-2002 Land Rover Discovery Series II SE - 4.0L Length 234-4694: 350 mm ( 13.78 inch), 234-4496: 600 mm ( 23.62 inch) Please check the description or use the year/make/model drop down bar and interchangeable part numbers to confirm the compatibility before purchase.